Mixed valent cyclopentadienyl group 6b metal-alkali metal...

C - Chemistry – Metallurgy – 08 – F

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C08F 4/69 (2006.01) C08F 10/00 (2006.01) C08F 4/639 (2006.01) C08F 4/6392 (2006.01)

Patent

CA 2218394

Disclosed is a catalyst system for the homopolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a mixed-valent dimeric Group 6b metal compound catalyst precursor wherein one atom of said Group 6b metal is a cyclopentadienyl Group 6b metal hydrocarbyl complex in which the Group 6b metal has an oxidation state +3 and wherein one atom of said Group 6b metal is a cyclopentadienyl alkaryl complex in which the Group 6b metal has an oxidation state +1, said dimeric Group 6b metal compound being supported on an inorganic support. The catalyst system can contain, in addition, a Group 2 or Group 3 metal-alkyl compound.

Système de catalyseurs d'homopolymérisation d'alpha-oléfines à 2 à 8 atomes de carbone comprenant comme précurseur de catalyse un composé dimère à plusieurs valences d'un métal du groupe 6b dans lequel un atome dudit métal est un complexe cyclopentadiényle où le métal présente un état d'oxydation +3 et dans lequel un atome dudit métal est un complexe cyclopentadiénylalcaryle où le métal présente un état d'oxydation +1, lesdits composés dimères étant placés sur un support organique. Le système de catalyseurs peut contenir de plus un composé alkyl-métal du groupe 2 ou du groupe 3.

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